#include <iostream>
using namespace std;
#ifndef FAMILY_H
#define FAMILY_H
class Mother
{
	public:
		Mother();
		Mother(int a);
};
class Daughter: public Mother
{
	public:
		Daughter(int a);
};
class Son: public Mother
{
	public:
		Son(int a) : Mother(a)
		{
			cout << "son: int parameter.\n";
		}
};
#endif